Update:

Found a 1227747 ECM w/ASDU bin at local Salvage Yard so couldn't pass it up. I know there is a lot more support for this ECM so thought it was a good thing, especially for 35 bucks.
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Thought I might share this document for those that could use it now and in the future. Maybe a Site Leader like Mark can put in the archives.

Dave, Well I replaced the Cap, Rotor and Coil.. and it still surges/hunts at what is supposed to be idle. When I look at the timing during this time it fluctuates from about 12-15 degress advanced....

I can explain the system voltage. I don't have the alternator hooked up so the over voltage is a result from the charger hooked up. I will get the alternator hooked up to remove this issue.

As...

thanks for your input.. Things for me to check out. Yeah I don't have any spare parts laying around to be swapping out. I checked the fuel pressure and it was at 10-11 psi.. I know form what the...

Dave, I used the adx file that Mark posted here http://www.gearhead-efi.com/Fuel-Injection/showthread.php?521-1228747-ECM-Information-4F
file $4F-1228747-HD-V1.1.adx.. The bin file that is on the...

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Here is a log file with engine running idle. Hopefully it can tell you guys something that you can share with me. I'm at a loss at this point in what to do.

I looked at the thread with the information on the 1228747 ECM.. I didn't see the bin file that I have (AKWC). I downloaded TunerPro RT but have no idea where to start. At this point I just want to...

thanks I will check it out.. Do you burn your own chips or do use a EEProm setup?

Jim, I was just saying Hi here in this thread. I created another thread under the GM EFI Forum that has more details. Please check out.. Thanks

Don't have TunerPro RT.. I do have WINADL will that work.. Not sure that I need to do any tuning yet because it is all original engine with original fuel/spark system.

Fast355, So are you saying the HD TBI setup it will never go into closed loop at idle then revving engine up even at normal operating temp.

EagleMark, I will hook up the knock sensor, thanks.. I...

I installed a complete 5.7L GM Motor and fuel/spark management system ecm (1228747 not 1227747) from a 89 GMAC G3500 Box Van.

The MAP Sensor tube is plugged into the middle vacuum line in the rear...

21-22" at about 750-800 RPM... No vacuum leaks.. Timing looks correct, set initial timing with bypass unplugged to 0 degrees. Turned engine off plugged bypass back up, cranked backup and ECM to over,...

Thanks for this great information.. Love this Site!!!

Recently installed TBI unit in 83 Jeep CJ-7... Complete donor engine and TBI system from a 89 GMC G3500 Box Van.. ECM 1228747

Got it running after setting initial timing with bypass unhooked....

Looking for guidance for my TBI install. Have read a lot of post and information is great knowledge. Thanks so far...

Looking for guidance for my TBI install.